MathML semantic and units

One thing we haven't talked about specifically is units. Currently there is
a note that says to tag them with the class name "MathML-Unit". This and
other tokens like ℝ are things that I believe should be covered by the
semantics proposal. I don't see them as a problem for any of the current
proposals, but we have no examples of them and there should be at least one
or two examples showing the markup for them to demonstrate how the proposal
handles them.

    Neil


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